Github user cloud-fan commented on the issue:
https://github.com/apache/spark/pull/19981
I don't think `AppStatusPlugin` is well designed to support both live and
history server. The fact that `SQLAppStatusPlugin` needs flags to decide to
register the listener in `setupListeners` or `setupUI` looks pretty hacky.
I also not sure why we need a plugin interface for live UI. The SQL and
Streaming UI are implemented pretty well and clean. I do agree that an
interface for history server is very useful, and that's why we have
`SparkHistoryListenerFactory` before.
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